Diffractive Contribution to $g_1$ Structure Function at Small $x$

Abstract

We study the small $x$ diffractive contribution to the spin--dependent proton structure function $g_1(x)$. We find that the $x\to 0$ behaviour of $g_1(x)$ has a singular form like $1/(x^{\alpha }{\ln }^2(x))$ with $\alpha \sim 0.2-0.3$.

Comments: 7 pages, latex, 3 Ps figures